Abstract: Negative-working imageable elements have an imageable layer comprising a free radically polymerizable component, an initiator composition capable of generating radicals sufficient to initiate polymerization of the free radically polymerizable component upon exposure to imaging radiation, a radiation absorbing compound, one or more polymeric binders, and at least 5 weight % of core-shell particles comprising a hydrophobic polymeric core and a hydrophilic polymeric shell that is covalently bound to the polymeric core. The hydrophilic polymeric shell has one or more zwitterionic functional groups. These elements can be imaged such as by IR lasers to provide lithographic printing plates.

Abstract: Positive-working imageable elements comprise a radiation absorbing compound and inner and outer layers on a substrate having a hydrophilic surface. The inner layer comprises a specific polymeric binder represented by Structure (I): -(A)w-(B)x-(C)y-(D)z-??(I) wherein A represents recurring units derived from one or more N-alkoxymethyl (alkyl)acrylamides or alkoxymethyl (alkyl)acrylates, B represents recurring units derived from one or more ethylenically unsaturated polymerizable monomers having a pendant cyano group, C represents recurring units derived from one or more ethylenically unsaturated polymerizable monomers having one or more carboxy, sulfonic acid, or phosphate groups, D represents recurring units derived from one or more ethylenically unsaturated polymerizable monomers other than those represented by A, B, and C, w is from about 3 to about 80 weight %, x is from about 10 to about 85 weight %, y is from about 2 to about 80 weight %, and z is from about 10 to about 85 weight %.

Abstract: Negative-working, on-press developable imageable element have improved shelf life and press run length because they include a free radically polymerizable composition comprising two or more ethylenically unsaturated compounds, each of which has two or more terminal acrylate groups, provided at least one of the ethylenically unsaturated compounds further comprises alkylene glycol units. In addition, the molar ratio of terminal acrylate groups to the alkylene glycol units in the non-polymeric free radically polymerizable composition is from about 1.25:1 to about 3:1.

Abstract: An imaged and developed element, such as a lithographic printing plate, is provided by infrared radiation imaging of a negative-working imagable element having an outermost imagable layer that includes a free radically polymerizable component, a free radical initiator composition comprising a diaryliodonium borate, and an infrared radiation absorbing compound. The imagable layer also includes a polymeric binder that is represented by the following Structure (I): -(A)w-(A?)w?-??(I) wherein A represents recurring units comprising a pendant reactive vinyl group, A? represents recurring units other than those represented by A, w is from about 1 to about 70 mol %, and w? is from about 30 to about 99 mol %. The imagewise exposed element is developed with a gum to remove only the non-exposed regions. The gum has a pH greater than 7 and up to about 11 and at least 1 weight % of an anionic surfactant.

Abstract: A radiation-sensitive composition includes a radically polymerizable component, initiator composition, a radiation absorbing compound, and a polymeric binder having recurring units that are derived from various ethylenically unsaturated polymerizable monomers provided that at least 40 mol % of the recurring units have a tertiary carbon atom in the backbone and the rest of the recurring units have a secondary or quaternary carbon atom in the backbone. This composition can be used to provide negative-working imageable elements that can be imaged and developed to provide lithographic printing plates that have desired imaging speed and excellent run length without the need for a post-exposure backing step.

Abstract: Negative-working imageable elements can be imaged and processed to provide lithographic printing plates, especially with sulfuric acid-anodized aluminum substrates. These elements have an imageable outermost layer that contains two different polymeric binders, a primary polymeric binder is optionally present a discrete particles, and a secondary polymeric binder comprising a poly(vinyl acetate) that has a degree of hydrolysis of less than 60 mol %. These imageable elements can be designed for either off-press or on-press development.

Abstract: A substrate useful for forming lithographic printing plate precursors includes a metal or polymer support and an interlayer comprising a trialkoxysilyl polyethylene glycol acrylate having the following Structure (I): wherein R1 and R2 are independently hydrogen or C1 to C6 alkyl, C1 to C6 alkenyl, C1 to C6 alkoxy, C1 to C6 acyl, C1 to C6 acyloxy, phenyl, halo, or cyano groups, or R1 and R2 together can form a cyclic group, R3 is hydrogen, or a C1 to C6 alkyl, phenyl, halo, or cyano group, R4 and R5 are independently hydrogen or methyl groups, R6 is hydrogen or a C1 to C12 alkyl group, X1 is —O— or —NR— wherein R is hydrogen or an alkyl or aryl group, X2 is —NR?— wherein R? is hydrogen or an alkyl or aryl group, m is an integer of from 15 to 200, and n is an integer of from 1 to 12. The lithographic printing plates can be negative-working and particularly useful for on-press development and have a sulfuric acid-anodized aluminum support.

Abstract: A negative-working imagable composition and element includes an initiator composition, an infrared radiation absorbing compound, a polymeric binder, and a stabilizing composition. The imaged element can be developed on-press and exhibits improved shelf-life under high humidity conditions. The stabilizing composition comprising at least one compound represented by Structure (ST-I) and at least one compound represented by Structure (ST-II): wherein m is 1 or 2, n is 1 to 50, R is hydrogen when m is 1, R1 through R3 are independently hydrogen or methyl, and L is an aliphatic, carbocyclic, heterocyclic, heteroatom divalent linking group, or a combination thereof.

Abstract: An imaged and developed element, such as a lithographic printing plate, is provided by infrared radiation imaging of a negative-working imageable element having a free radically polymerizable component, a free radical initiator composition, an infrared radiation absorbing compound, and adhesion promoter that is an organic compound having an ethylenically unsaturated carbon-carbon double bond that is connected to an alkoxysilyl or hydroxysilyl group. The use of the adhesion promoter provides increased printing durability for the imaged and developed element, especially those having sulfuric acid-anodized aluminum substrates.

Abstract: Single- and multi-layer positive-working imageable elements include a first polymeric binder that is soluble in an alkaline developer upon exposure to imaging radiation and a radiation absorbing compound. The first polymeric binder comprises a backbone to which are attached pendant groups represented by the following Structure (I): wherein R1 and R2 are independently hydrogen or alkyl groups having 1 to 8 carbon atoms or aryl groups having 6 or 10 carbon atoms in the carbocyclic ring, L is a direct bond or a linking group having at least 1 carbon atom and optionally one or more nitrogen, oxygen, and sulfur atoms in the linking chain, and X is oxy, thio, or —NR— wherein R is hydrogen or an alkyl group having 1 to 8 carbon atoms or an aryl group having 6 or 10 carbon atoms in the carbocyclic ring.

Abstract: An imaged and developed element, such as a lithographic printing plate, is provided by violet radiation imaging of a negative-working imageable element having an outermost imageable layer that includes a free radically polymerizable component, an initiator composition that provides free radicals upon violet irradiation, a sensitizer, and a polymeric binder having pendant reactive vinyl groups. The element also includes an additive that is represented by the following Structure (II): wherein R1, R2, R3, and R4 are independently hydrogen, or alkyl, alkenyl, cycloalkyl, or aryl groups. The imaged element can be developed using a gum having a pH greater than 6 and up to about 11 and comprising at least 1 weight % of one or more anionic surfactants.

Abstract: A negative-working imageable composition and element includes an initiator composition, an infrared radiation absorbing compound, a polymeric binder, and a stabilizing composition. The imaged element can be developed on-press and exhibits improved shelf-life under high humidity conditions. The stabilizing composition comprising at least one compound represented by Structure (ST-I) and at least one compound represented by Structure (ST-II): wherein m is 1 or 2, n is 1 to 50, R is hydrogen when m is 1, R1 through R3 are independently hydrogen or methyl, and L is an aliphatic, carbocyclic, heterocyclic, heteroatom divalent linking group, or a combination thereof.

Abstract: A radiation-sensitive composition includes a radically polymerizable component and an iodonium borate initiator composition capable of generating radicals sufficient to initiate polymerization of the free radically polymerizable component upon exposure to imaging radiation. The iodonium borate composition includes a particular diaryliodonium borate compound having organic substituents to provide a sum of at least 6 carbon atoms on the iodonium cation phenyl rings. This composition can be applied to a suitable substrate to provide a negative-working imageable element with improved digital speed and good shelf life and that can be imaged to provide lithographic printing plates. The imaged elements can be developed either on-press or off-press using alkaline developers.

Abstract: An imaged and developed element, such as a lithographic printing plate, is provided by infrared radiation imaging of a negative-working imageable element having an outermost imageable layer that includes a free radically polymerizable component, a free radical initiator composition comprising a diaryliodonium borate, and an infrared radiation absorbing compound. The imageable layer also includes a polymeric binder that is represented by the following Structure (I): -(A)w-(A?)w?-??(I) wherein A represents recurring units comprising a pendant reactive vinyl group, A? represents recurring units other than those represented by A, w is from about 1 to about 70 mol %, and w? is from about 30 to about 99 mol %. The imagewise exposed element is developed with a gum to remove only the non-exposed regions. The gum has a pH greater than 7 and up to about 11 and at least 1 weight % of an anionic surfactant.

Abstract: A negative-working imageable element has an imageable layer that includes an initiator composition including an iodonium cation and a boron-containing anion at a molar ratio of at least 1.2:1, an infrared radiation absorbing compound, a primary polymeric binder, and a spirolactone or spirolactam colorant precursor. The imaged element exhibits improved print-out.

Abstract: Positive-working imageable elements comprise a radiation absorbing compound and inner and outer layers on a substrate having a hydrophilic surface. The inner layer comprises a specific polymeric binder represented by Structure (I): (A)w-(B)n-(C)y-(D)z??(I) wherein A represents recurring units derived from one or more N-alkoxymethyl (alkyl)acrylamides or alkoxymethyl (alkyl)acrylates, B represents recurring units derived from one or more ethylenically unsaturated polymerizable monomers having a pendant cyano group, C represents recurring units derived from one or more ethylenically unsaturated polymerizable monomers having one or more carboxy, sulfonic acid, or phosphate groups, D represents recurring units derived from one or more ethylenically unsaturated polymerizable monomers other than those represented by A, B, and C, w is from about 3 to about 80 weight %, x is from about 10 to about 85 weight %, y is from about 2 to about 80 weight %, and z is from about 10 to about 85 weight %.

Abstract: A radiation-sensitive composition includes a radically polymerizable component, initiator composition, a radiation absorbing compound, and a polymeric binder having recurring units that are derived from various ethylenically unsaturated polymerizable monomers provided that at least 40 mol % of the recurring units have a tertiary carbon atom in the backbone and the rest of the recurring units have a secondary or quaternary carbon atom in the backbone. This composition can be used to provide negative-working imageable elements that can be imaged and developed to provide lithographic printing plates that have desired imaging speed and excellent run length without the need for a post-exposure backing step.

Abstract: A radiation-sensitive composition and negative-working imageable element includes a polymeric binder that has a hydrophobic backbone and pendant salt groups that comprise a cation covalently attached to the hydrophobic backbone and a boron-containing anion forming a salt with the cation. The use of these particular polymers provides fast digital speed (high imaging sensitivity) and good printability (good shelf-life) even when the preheat step normally used between exposure and development, is omitted.

Abstract: Sulfated polymers, imageable elements containing these polymers, and methods for preparing images useful as lithographic printing plates from these imageable elements are disclosed. The sulfate groups are attached either to aryl groups that are pendent to the polymer backbone, and/or to alkyl groups that are either pendant to the polymer backbone and/or part of the polymer backbone. The elements can be thermally imaged and developed in water or in fountain solution so that an alkaline developer is not required. They can be imaged and developed on press using fountain solution so that it is unnecessary to mount them in a separate exposure device.

Abstract: Negative-working imagable elements can be imaged and then developed using a lower pH organic-based single-phase developer that is less toxic and corrosive and that can be more readily disposed of after use. This developer has a pH less than 12 and comprises a) an amphoteric surfactant comprising a nitrogen-containing heterocycle, b) an amphoteric surfactant having two or more nitrogen atoms, or c) an amphoteric surfactant of a) and an amphoteric surfactant of b).